Blasting construction technology for water diversion tunnel rock plug with high water permeability

Abstract

The invention provides a blasting construction technology for a water diversion tunnel rock plug with high water permeability. The blasting construction technology comprises the following steps: excavating a water diversion tunnel, reserving the rock plug between the water diversion tunnel and a reservoir, and excavating a slag collecting pit in the water diversion tunnel; drilling cutting holes,auxiliary holes and presplitting holes in the rock plug, filling the cutting holes, the auxiliary holes and the presplitting holes with explosives and electronic detonators respectively, and hen connecting all the electronic detonators with a controller arranged outside the water diversion tunnel by detonating cords; controlling the corresponding explosives in the presplitting holes, the cutting holes and the auxiliary holes by a controller to blast and destroy the rock plug in sequence, so as to connect the water diversion tunnel with the reservoir. According to the technical scheme, the slagcollecting pit is arranged in the water diversion tunnel in advance, so that earth-rock after blasting of the rock plug is washed into the slag collecting pit by water flow, and blockage to the waterdiversion tunnel is prevented; and the presplitting holes, the cutting holes and the auxiliary holes are blasted in sequence, and surrounding rock of the rock plug is reinforced before blasting, so that water seepage in the adjacent area of the rock plug is prevented and safety of construction personnel is ensured.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to a blasting construction technique for water diversion tunnels with strong seepage rock plugs. Background technique [0002] The water diversion tunnel is a kind of water conservancy facility built for taking the water accumulated in the reservoir. In the prior art, during the construction of the water diversion tunnel, rock plugs are often reserved at the end section of the water diversion tunnel, and then the rock plugs are made by blasting construction. The plug is destroyed, so that the diversion tunnel and the reservoir are connected to guide the water flow out, so as to take the water source. In the prior art, when the rock plug is destroyed by blasting, the corresponding earthwork will be washed out by the water flow. If there are more earthwork in the rock plug, then The water diversion tunnel will be blocked, resulting in a reduction in the water flo...

AI Technical Summary

Problems solved by technology

[0002] The water diversion tunnel is a kind of water conservancy facility built for taking the water accumulated in the reservoir. In the prior art, during the construction of the water diversion tunnel, rock plugs are often reserved at the end section of the water diversion tunnel, and then the rock plugs are made by blasting construction. The plug is destroyed, so that the diversion tunnel and the reservoir are connected to guide the water flow out, so as to take the water source. In the prior art, when the rock plug is destroyed by blasting, the corresponding earthwork will be washed out by the water flow. If there are more earthwork in the rock plug, then The water diversion tunnel will be blocked, resulting in a decrease in the water flow out of the water diversion tunnel, which will affect the water intake effect of the water diversion tunnel

In addition, water diversion tunnels are generally formed by excavating ground soil. Most of the underground soil adjacent to the reservoir is soaked by the water in the reservoir, and the corresponding surrounding rock becomes soft and prone to leakage, threatening to blast the rock plug. personnel safety

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